export: Implement EXPORT subcommand (#9822)

Teach the export command to handle export sets defined by invocations
of install(TARGETS ... EXPORT foo).  This makes maintenance of targets
exported to both the build tree and install tree trivial.
Help: cmake-packages: Add missing slash.
Don't copy find_dependency in configure_package_config_file.

There is not really any need to. Downstreams can either rely on it
being provided by CMake, or copy and distribute it.

Change the documented include for the find_dependency macro.
Help: Document export(EXPORT) in the cmake-packages manual.
Merge topic 'export-EXPORT-subcommand' into next

402db78 Help: Document export(EXPORT) in the cmake-packages manual.
24ed23e Don't copy find_dependency in configure_package_config_file.
2fa48ab Help: cmake-packages: Add missing slash.
83fdce3 export: Implement EXPORT subcommand (#9822)
Take reference, don't copy.

The map owns and deletes the cmExportSet object otherwise.
export: Implement EXPORT subcommand (#9822)

Teach the export command to handle export sets defined by invocations
of install(TARGETS ... EXPORT foo).  This makes maintenance of targets
exported to both the build tree and install tree trivial.
Help: cmake-packages: Add missing slash.
Don't copy find_dependency in configure_package_config_file.

There is not really any need to. Downstreams can either rely on it
being provided by CMake, or copy and distribute it.

Change the documented include for the find_dependency macro.
Help: Document export(EXPORT) in the cmake-packages manual.
Merge topic 'export-EXPORT-subcommand' into next

875ffdc Take reference, don't copy.
Merge topic 'export-EXPORT-subcommand' into next

98b9f52 Help: Document export(EXPORT) in the cmake-packages manual.
a1d2bda Don't copy find_dependency in configure_package_config_file.
f4f6529 Help: cmake-packages: Add missing slash.
cbe7e8f export: Implement EXPORT subcommand (#9822)
Use cmTarget::GetSupportDirectory for <OBJECT_DIR> replacement

It returns a full path which we then convert relative to the proper
directory separately in the Makefile and Ninja generators.
Merge topic 'fix-compile-OBJECT_DIR' into next

bd57664 Use cmTarget::GetSupportDirectory for <OBJECT_DIR> replacement
CTestCustom: Suppress LNK4089 warning about SHELL32.dll (lower case)
Merge topic 'suppress-LNK4089-SHELL32' into next

c5068c1 CTestCustom: Suppress LNK4089 warning about SHELL32.dll (lower case)